RadDataGrid supports different selection modes that can be modified by the following properties:

First, you can choose the Unit that you will be allowed to select and then the Selection Mode.

SelectionUnit property (type of DataGridSelectionUnit):

Row: The unit to select is a grid row(by default).

Cell: The unit to select is a cell within a grid row.

To define a Cell when using a selection you can use the DataGridCellInfo class, that holds all the information about it. To define a Row when using a selection you can use your data object.

SelectionMode property (type of DataGridSelectionMode):

Single: Single unit may be selected(by default).

Multiple: Multiple units may be selected.

None: No selection is allowed.

Once you make a selection, you can get or modify a collection with the selected Items by using:

SelectedItems property (type of ObservableCollection): Gets or Modifies an ObservableCollection of the currently selected Items(their type depends on the applied SelectionUnit, that is, DataGridCellInfo for Cell and Data Item for Row).